Method for installing a drain material in a water-containing poor subsoil

ABSTRACT

Drain material formed into a column-shaped or rod-shaped member of an extremely light continuous cellular foamed synthetic resinous material is used for withdrawing water from a watercontaining poor subsoil to improve the strength or condition of the soil. For facilitating the insertion of the drain member into the subsoil, the drain member is inserted within a casing pipe prior to installation. A stopper which engages the lower end face of the casing pipe is secured to that lower portion of the drain member which extends downwardly from the lower end of the casing pipe. When the casing pipe, within which the drain member is accommodated, is driven into subsoil, the stopper functions to prevent the drain member from being shifted upwardly by resisting the lifting through the soil, at the stage of removing the casing pipe, said stopper utilizing the soil resistance acting thereon, functions to prevent the drain member from being withdrawn with the pipe.

United States Patent [1 1 Ohtsuka Mar. 19, 1974 METHOD FOR INSTALLING A DRAIN MATERIAL IN A WATER-CONTAINING POOR SUBSOIL [30] Foreign Application Priority Data Sept, 1, 1972 Japan 47-66594 [52] US. Cl. 61/11, 6l/53.5 [5i] Int. Cl E02b 11/00, E02b 13/00 [58] Field of Search 61/11, l2, l3, 10, 63,

I [56] References Cited UNITED STATES PATENTS i2/1951 Kjellmanl 61/11 9/1968 Rodgers 6l/13 1/1967 Maeda 61/63 Primary ExaminerJacob Shapiro Attorney, Agent, or Firm George B. Oujevolk [5 7] ABSTRACT Drain material formed into a column-shaped or rodshaped member of an extremely light continuous cellular foamed synthetic resinous material is used for withdrawing water from a water-containing poor subsoil to improve the strength or condition of the soil. For facilitating the insertion of the drain member into the subsoil, the drain member is inserted within a casing pipe prior to installation. A stopper which engages the lower end face of the casing pipe is secured to that lower portion of the drain member which extends downwardly from the lower end. of the casing pipe. When the casing pipe, within which the drain member is accommodated, is driven into subsoil, the stopper functions to prevent the drain member from being shifted upwardly by resisting the lifting through the soil, at the stage of removing the casing pipe, said stopper utilizing the soil resistance acting thereon, functions'to prevent the drain member from being withdrawn with the pipe.

3 Claims, 10 Drawing Figures Pmmmm w M SHEET 1 [1F 3 FIG. 4

Pmmwm 19 m4 SHEET 2 OF 3 FIG. 6 k

FIG. 5

PATENTEU IIAR I 9 H74 SHEETEINS FIG. 8

FIG.

FIG. 9

FIG

METHOD FOR INSTALLING A DRAIN MATERIAL IN A WATER-CONTAINING POOR SUBSOIL I SUMMARY OF THE INVENTION The present invention relates to a new method for installing a light and elongated drain member in a high water-containing poor subsoil, for use in withdrawing water to improve the strength or condition'of the soil.

OBJECTS OF THE INVENTION The principal object of the present invention is to provide a method for installing a drain material in a water-containing poorsubsoil, wherein a light and elongated drain member of a continuous cellular foamed synthetic resinous material is inserted within a casing pipe; a stopper which will engage a lower end face of the casing pipe is fixed on the drain member, said stopper serving for facilitating the insertion of the drain member in the water-containing poor subsoil; and when the casing pipe is removed from of the watercontaining poor subsoil, the drain member is prevented from shifting upwards by the stopper on which the soil resistance acts.

Another object of the present invention is to provide a method for installing a drain 'material in a watercontaining poor subsoil, wherein a hairpin-shaped resilient clip of steel is used as a stopper, thereby providing simplicity in securing the stopper to the drain material.

A further object of the present invention is to provide a method for installing a drain material in a watercontaining poor subsoil, wherein after the casing pipe is completely removed from the water-containing poor subsoil, another stopper is secured to the drain member, and subsequently, the drain member is cutoff between the stopper and the surface of the watercontaining poor subsoil, thus proceeding with the installation of the drain member from one spot to the other, with ease, on the water-containing poor jsubsoil.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 6 is a longitudinal sectional side view showing the casing pipe in the stage of withdrawing,

FIG. 7 is a longitudinal sectional side view showing another stopper, said another stopper being secured to the drain member, after the casing pipe is completely withdrawn out of the soil;

FIG. 8 is a longitudinal sectional side view showing the cut-off drain member; and,

, casing pipe 1 is driven to the subsoil 9 into the prede- FIGS. 9 and 10 are cross-sectional views exemplifying the shape of a casing pipe and a drain member to be inserted therein.

DETAIL DESCRIPTION OF THE INVENTION Referring to FIGS. 1 through 3, an elongated c0- lumn-shaped and square cross-sectional drain member 2 of a continuous cellular foamed synthetic resinous material is inserted in a steel tubular casing pipe 1 having a circular cross-section, and a stopper 3 is secured to the lower portion of the drain member 2 which extends downwardly from the low-er end of the casing pipe 1.

Said casing pipe 1 should preferably be made of steel and have the dimension which ranges, for example, from 8to 160 mm in the inner diameter, from 6 to 9 mm in a wall thickness and from 9 to l 6 m in the overall length. The casing pipe 1 is provided with holes 4 in its upper portion, through which suspension hooks will be engaged.

A continuous cellular foamed synthetic resinous material available for forming the drain member is, for example, a polyurethane sheet having a space rate of to percent. The drain member 2 has a square crosssection, each side of which is from 50 to mm long and is formed as an elongated continuous body.

The stopper 3 is a hairpin-shaped clip made of steel of 3.2 to 6 mm thick and having alongitudianl length larger than the diameter of the casing pipe. For fastening the stopper to the drain member 2, both resilient arms 5 of the stopper 3 are forcibly and resiliently opened to receive the drain member 2 therebetween, after which the force exerted upon the arms is released, whereby the arms 5 resiliently hold the drain member from both sides and thereby the clip is tightly secured to the drain member 2.

In FIGS. 4 through 8 showing the method for installing in the water-containing poor subsoil the casing pipe within which said drain member is accommodated, a steel cap 7 having a side opening 6, through which the drain member is introduced into the casing pipe, is mounted around an upper end portion of the casing pipe 1, as shown in FIGS. 4 and 5. When the casing pipe 1 is to be inserted downwardly in the watercontaining poor subsoil by the continuous blow of a vibrator 8 mounted on said steel cap 7, the drain member 2 accommodated within the pipe is driven into the viater-containing poor subsoil, being received therein because of the stopper being fixed to the lower portion of p the drain member 2 and maintained in engagement with the lower end face of the casing pipe 1. After the termined depth, the cap 9 is removed from the casing pipe '1.

As seen in FIG. 6, suspension hooks 10 connected to a lower portion of the vibrator 8 are fitted in the holes 4 provided at the upper end portion of the casing pipe 1, and then, the casing pipe 1 is caused to be withdrawn out of the water-containing poor subsoil 9 by a rope I 1 of a hoist, with vibration being given by the vibrator 8. In the meantime, the drain member 2 is left unshifted in the water-containing poor subsoil 9 by the frictional force between the casing pipe 1 and the drain member and with the aid of the stopper fixed to the lower portion of the drain member and the soil resistance acting thereon, thereby to be maintained in position in the water-containing poor subsoil 9. t

As shown in FIG. 7, after the casing pipe 1 is completely pulled out from the water-containing poor subsoil 9, another stopper 3 to engage the lower end face of the casing pipe 1 is fixed to the drain member 2, and succeedingly, the drain member 2 is cut off between said stopper and the surface of the water-containing poor subsoil. The casing pipe 1 and the drain member accommodated therein and carrying the stopper 3 are transferred to the other installation spot.

According to the installation method as set forth in the foregoing passages, numbers of drain member are installed in the water-containing poor subsoil. After the completion of installation, the load of sand is exerted on the surface of the water containing poor subsoil 9, whereby water contained in the poor subsoil is withdrawn upwardly through respective drain members 2.

FIGS. 9 and 10 are cross-sectional views showing the relationship between the casing pipe and the drain member. In the example of FIG. 9, both the drain member and the casing pipe 1 each have a circular crosssection, while in that of FIG. 10, either of them has a square cross-section. I

The embodiment as disclosed in the foregoing passages is only an example of this invention, and changes or modifications on design and construction may be made without departing from the scope of the invention.

What is claimed is:

1. A method for installing a drain material in a poor subsoil which contains water so as to drain the subsoil of the water, comprising the steps of:

a. driving vertically downwards through the soil to the subsoil an elongated casing there having been inserted into said casing a continuous cellular foamed synthetic resinous drain material, said drain material having a portion extending outward of said casing lower end with a resilient clip fastened to said outward extending portion, said clip including arms extending beyond the width of said casing;

b. withdrawing the casing from the subsoil, the pressure of said subsoil on said extending arms permitting said casing to be slipped out of the subsoil and soil leaving the drain material in place extending from the subsoil to the soil.

2. A method for installing a drain material in a watercontaining poor subsoil of claim 1, wherein said stopper is a U-shaped clip made of steel.

3. A method for installing a drain material in a watercontaining poor subsoil of claim 1, wherein another stopper adapted to engage the lower end face of the casing pipe is fixed to the drain material, after the casing pipe has been pulled out of the water-containing poor subsoil, said drain member being cut off between said stopper and a soil surface of the water-containing poor subsoil. 

1. A method for installing a drain material in a poor subsoil which contains water so as to drain the subsoil of the water, comprising the steps of: a. driving vertically downwards through the soil to the subsoil an elongated casing there having been inserted into said casing a continuous cellular foamed synthetic resinous drain material, said drain material having a portion extending outward of said casing lower end with a resilient clip fastened to said outward extending portion, said clip including arms extending beyond the width of said casing; b. withdrawing the casing from the subsoil, the pressure of said subsoil on said extending arms permitting said casing to be slipped out of the subsoil and soil leaving the drain material in place extending from the subsoil to the soil.
 2. A method for installing a drain material in a water-containing poor subsoil of claim 1, wherein said stopper is a U-shaped clip made of steel.
 3. A method for installing a drain material in a water-containing poor subsoil of claim 1, wherein another stopper adapted to engage the lower end face of the casing pipe is fixed to the drain material, after the casing pipe has been pulled out of the water-containing poor subsoil, said drain member being cut off between said stopper and a soil surface of the water-containing poor subsoil. 